Date Grouping by specific interval

Hi all,
I have a case where i need to build a query to count the dates and then group them by a specific interval, I mean the user may select a date range 1 year but group the result by 7 days, so the query must return counts of dates for every 7 days.
lets have the following table : (the real database store the date as long (date in milliseconds))
Date | SevEnum
1-Feb-2010 00:00:00 | 1
1-Feb-2010 15:00:00 | 1
2-Feb-2010 12:00:00 | 1
2-Feb-2010 14:00:00 | 1
3-Feb-2010 00:00:00 | 1
3-Feb-2010 06:00:00 | 1
The user can enter any interval he want, examples:
grouping by *1 year*
result must by :
Date | Count
2010 | 6
grouing by *1 day*
Date | Count
1-Feb-2010 | 2
2-Feb-2010 | 2
3-Feb-2010 | 2
grouing by *2 days*
Date | Count
1-Feb-2010 | 4
3-Feb-2010 | 2
the User can group the date by any time Unit (seconds, minutes, hours,days, week,months,years)
I can't using TRUNC() because, its just for specific unit (ex. just 1 day, not 2 days).
Is there any idea or logic to be general as possible, please advice.
thanks,
Edited by: user9183438 on Mar 9, 2010 3:20 AM
Edited by: user9183438 on Mar 9, 2010 3:21 AM

You can use TRUNC to truncate by day, month, hour, etc:
SQL> SELECT TRUNC(sysdate, 'mm')
2 FROM   dual;
TRUNC(SYSDATE,'M
01/03/2010 00:00As for the other requirement - do the users really need to be able to group by "2 days"? Is it meaningful?
If so, then here's a method of doing what you're after (I've included various truncates just to give an idea of how the data may differ):
with dates as (select trunc(sysdate, 'mm') -10 + level dt
               from   dual
               connect by level <= 40)
select dt,
       trunc(dt, 'mm') by_month,
       trunc(dt, 'iw') by_week,
       trunc(dt, 'yyyy') by_year,
       trunc(dt, 'dd') by_day,
       trunc(dt, 'yyyy') + trunc(to_char(dt, 'ddd')/2)*2 by_2_days,
       trunc(dt, 'yyyy') + trunc(to_char(dt, 'ddd')/14)*14 by_14_days,
       trunc(dt, 'iyyy') + trunc(to_char(dt, 'iw')/2)*2*7 by_fortnight
from   dates;
DT         BY_MONTH   BY_WEEK    BY_YEAR    BY_DAY     BY_2_DAYS BY_14_DAYS BY_FORTNIGHT
20/02/2010 01/02/2010 15/02/2010 01/01/2010 20/02/2010 20/02/2010 12/02/2010 15/02/2010
21/02/2010 01/02/2010 15/02/2010 01/01/2010 21/02/2010 22/02/2010 12/02/2010 15/02/2010
22/02/2010 01/02/2010 22/02/2010 01/01/2010 22/02/2010 22/02/2010 12/02/2010 01/03/2010
23/02/2010 01/02/2010 22/02/2010 01/01/2010 23/02/2010 24/02/2010 12/02/2010 01/03/2010
24/02/2010 01/02/2010 22/02/2010 01/01/2010 24/02/2010 24/02/2010 12/02/2010 01/03/2010
25/02/2010 01/02/2010 22/02/2010 01/01/2010 25/02/2010 26/02/2010 26/02/2010 01/03/2010
26/02/2010 01/02/2010 22/02/2010 01/01/2010 26/02/2010 26/02/2010 26/02/2010 01/03/2010
27/02/2010 01/02/2010 22/02/2010 01/01/2010 27/02/2010 28/02/2010 26/02/2010 01/03/2010
28/02/2010 01/02/2010 22/02/2010 01/01/2010 28/02/2010 28/02/2010 26/02/2010 01/03/2010
01/03/2010 01/03/2010 01/03/2010 01/01/2010 01/03/2010 02/03/2010 26/02/2010 01/03/2010
02/03/2010 01/03/2010 01/03/2010 01/01/2010 02/03/2010 02/03/2010 26/02/2010 01/03/2010
03/03/2010 01/03/2010 01/03/2010 01/01/2010 03/03/2010 04/03/2010 26/02/2010 01/03/2010
04/03/2010 01/03/2010 01/03/2010 01/01/2010 04/03/2010 04/03/2010 26/02/2010 01/03/2010
05/03/2010 01/03/2010 01/03/2010 01/01/2010 05/03/2010 06/03/2010 26/02/2010 01/03/2010
06/03/2010 01/03/2010 01/03/2010 01/01/2010 06/03/2010 06/03/2010 26/02/2010 01/03/2010
07/03/2010 01/03/2010 01/03/2010 01/01/2010 07/03/2010 08/03/2010 26/02/2010 01/03/2010
08/03/2010 01/03/2010 08/03/2010 01/01/2010 08/03/2010 08/03/2010 26/02/2010 15/03/2010
09/03/2010 01/03/2010 08/03/2010 01/01/2010 09/03/2010 10/03/2010 26/02/2010 15/03/2010
10/03/2010 01/03/2010 08/03/2010 01/01/2010 10/03/2010 10/03/2010 26/02/2010 15/03/2010
11/03/2010 01/03/2010 08/03/2010 01/01/2010 11/03/2010 12/03/2010 12/03/2010 15/03/2010
12/03/2010 01/03/2010 08/03/2010 01/01/2010 12/03/2010 12/03/2010 12/03/2010 15/03/2010
13/03/2010 01/03/2010 08/03/2010 01/01/2010 13/03/2010 14/03/2010 12/03/2010 15/03/2010
14/03/2010 01/03/2010 08/03/2010 01/01/2010 14/03/2010 14/03/2010 12/03/2010 15/03/2010
15/03/2010 01/03/2010 15/03/2010 01/01/2010 15/03/2010 16/03/2010 12/03/2010 15/03/2010
16/03/2010 01/03/2010 15/03/2010 01/01/2010 16/03/2010 16/03/2010 12/03/2010 15/03/2010
17/03/2010 01/03/2010 15/03/2010 01/01/2010 17/03/2010 18/03/2010 12/03/2010 15/03/2010
18/03/2010 01/03/2010 15/03/2010 01/01/2010 18/03/2010 18/03/2010 12/03/2010 15/03/2010
19/03/2010 01/03/2010 15/03/2010 01/01/2010 19/03/2010 20/03/2010 12/03/2010 15/03/2010
20/03/2010 01/03/2010 15/03/2010 01/01/2010 20/03/2010 20/03/2010 12/03/2010 15/03/2010
21/03/2010 01/03/2010 15/03/2010 01/01/2010 21/03/2010 22/03/2010 12/03/2010 15/03/2010
22/03/2010 01/03/2010 22/03/2010 01/01/2010 22/03/2010 22/03/2010 12/03/2010 29/03/2010
23/03/2010 01/03/2010 22/03/2010 01/01/2010 23/03/2010 24/03/2010 12/03/2010 29/03/2010
24/03/2010 01/03/2010 22/03/2010 01/01/2010 24/03/2010 24/03/2010 12/03/2010 29/03/2010
25/03/2010 01/03/2010 22/03/2010 01/01/2010 25/03/2010 26/03/2010 26/03/2010 29/03/2010
26/03/2010 01/03/2010 22/03/2010 01/01/2010 26/03/2010 26/03/2010 26/03/2010 29/03/2010
27/03/2010 01/03/2010 22/03/2010 01/01/2010 27/03/2010 28/03/2010 26/03/2010 29/03/2010
28/03/2010 01/03/2010 22/03/2010 01/01/2010 28/03/2010 28/03/2010 26/03/2010 29/03/2010
29/03/2010 01/03/2010 29/03/2010 01/01/2010 29/03/2010 30/03/2010 26/03/2010 29/03/2010
30/03/2010 01/03/2010 29/03/2010 01/01/2010 30/03/2010 30/03/2010 26/03/2010 29/03/2010
31/03/2010 01/03/2010 29/03/2010 01/01/2010 31/03/2010 01/04/2010 26/03/2010 29/03/2010 You may find that you'll have to add or subtract onto the to_char(dt, 'ddd') values in order to make them us the same "start point" - eg. look at the difference for fortnight vs 14 days. Anyway, that should give you an idea of how you could do things.

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